S: (adj) singular (being a single and separate person or thing) "can the singular person be understood apart from his culture?"; "every fact in the world might be singular...unlike any other fact and sole of its kind"-William James

S: (adj) singular (grammatical number category referring to a single item or unit)

S: (adj) singular, unique (the single one of its kind) "a singular example"; "the unique existing example of Donne's handwriting"; "a unique copy of an ancient manuscript"; "certain types of problems have unique solutions"